JPH0624843B2 - Automatic screen printing equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an improvement of a screen printing machine. More specifically, the present invention relates to a control device for eliminating a cloth defect called so-called “reverse ghosting” which occurs at a joint portion between pieces of a cloth to be treated when a continuous cloth is printed by a screen printing machine.

2. Description of the Related Art A cloth to be treated which is set on an automatic screen printing machine is made into a roll of a long cloth by sequentially stitching a plurality of pieces of piece of cloth to each other, and the work of work for replacing the piece of cloth is omitted. Since one piece of cloth has a length of about 50 m, a knotted portion sewn by the sewing machine appears every 50 m in the cloth roll after being sewn back. Although this knotted portion has a short length, it has unevenness due to the sewing thread as compared to a regular cloth, and if the printing operation is performed as it is, the color paste in the screen that comes into contact with the portion is completely transferred. However, until it disappears, reprinting occurs several times to ten or more times on the surface of the fabric that passes through the screen, resulting in uneven color in the printed pattern. Depending on the printing conditions, this ghost image is several m to ten and several m in each woven part, and the loss is extremely large.

Conventionally, various measures have been studied to prevent the occurrence of anti-reflection images. For example, the structure of the processing machine has been changed, the anti-interaction method has been improved, and the prescription of color paste has been changed. It could not be an effective countermeasure. Attempts have also been made to produce a treated fabric as a long product from the weaving stage to reduce the number of knotted portions in the fabric roll.
Although we have realized a long piece of fabric with a length of 00 m, this is only useful for reducing the length of the defective portion due to the image of the fabric roll as a whole, and it can be said that the number has decreased. In this case, printing defects still occur and it is not a fundamental solution.

The object and structure of the invention The present invention overcomes the above-mentioned drawbacks of the prior art, and makes it possible to prevent the occurrence of a ghost image regardless of the number of woven regions, the type of printed pattern, the type of cloth to be treated, and the like. The purpose is to reduce the occurrence of defective counter as much as possible.

That is, an object of the present invention is to provide an automatic screen consisting of a belt conveyor for placing and advancing a work cloth in a stretched state and a plurality of screens provided with cages provided above the conveyor along the advancing direction of the cloth. In the textile printing device, pulse generation means for generating a pulse proportional to the length of cloth sent out, detection means for detecting the passage of the cloth concatenated part and issuing a signal, the cage attached to each screen is in the operating position and inactive position. To the cage operation means for selectively holding any one of them, and to start the counting of the pulse from the pulse generating means in response to the detection signal from the detecting means, and the count is the cloth between the detecting means and each screen. When the preset value corresponding to the length of the path is met, the cage operation for holding the cage of the screen in the inoperative position is carried out. It is achieved by the automatic screen printing apparatus comprising providing a controller emits a signal to the means.

EXAMPLES The present invention will be described in more detail based on the examples shown in the drawings.

FIG. 1 shows an example in which the present invention is applied to a rotary screen printing device.

The cloth 1 to be treated is placed in a stretched state on a rubber belt 3 running at a predetermined speed from a long cloth roll 2 whose ends are sewn one by one in advance or several tens of pieces in advance. Three
Move in the direction of the arrow at the same speed as. Above the belt 3, a plurality of rotary screens 4a are provided along the traveling direction of the fabric.
4b, 4c, and 4d are installed at a predetermined distance depending on the color pattern they are in charge of. Each of the screens has cages 5a to 5d therein, and the cage prints color glue on the cloth on the belt through the pattern pattern of the screen while slidingly contacting the lower portion of the inner surface thereof by the rotation of the screen.

If the cloth 1 has a confounding portion, the pressing force between the screen 4a and the cloth 1 is different from that for the normal portion, so that the amount of color paste applied to the cloth by the cage 5a changes. As a result, color unevenness occurs in the congealed portion. This color unevenness also occurs a plurality of times on the normal part of the cloth that subsequently passes through the screen, resulting in a so-called anti-reflection image.

In the present invention, in order to prevent this, firstly, the connection portion detecting means 6 including the pair of rollers 6a and 6b is provided in the cloth path before being introduced into the belt 3. The cloth 1 advances while being held by the rollers 6a and 6b. However, when the concatenated portion passes, the thickness of the cloth 1 suddenly increases, so that the upper roller 6a is displaced, and this displacement is used. Can be detected by a known displacement detecting means such as a differential transformer or a photoelectric element. This detection signal is sent to the controller 7 described later.
Entered in.

Further, a pulse generator 10 having a pulley 9 that rotates in synchronization with the shaft of a pulley 8 that drives the belt 3 is installed,
For example, one pulse is emitted for each rotation of the pulley 9. The rotation speed of the pulley 9 is proportional to the rotation speed of the pulley 8 of the belt 3, and the rotation speed of the pulley 8 is proportional to the speed of the belt 3, that is, the traveling speed of the cloth 1. Is equivalent to the delivery length of the fabric. This pulse signal is also input to the controller 7.

The cage 5a, etc. of the screen selectively takes one of an operating position in which the color glue is applied to the cloth by sliding contact with the inner surface of the screen and an inoperative position in which the color glue is not applied by being separated from the inner surface of the screen. Switching solenoid valve 11a to obtain
11d is connected to a cage operating means (not shown) such as an air cylinder having an electromagnetic valve 11a to 11d.
The switching instruction to 11d is issued from the controller 7.

In the apparatus of the present invention having the above-described structure, when the cloth-fed portion passes between the rollers 6a and 6b of the detecting means 6 during the processing of the cloth 1, the detection signal is transmitted to the controller 7 by the displacement of the roller 6a as described above. . In response to this signal, the controller 7 starts counting the pulses emitted from the pulse generator 10 corresponding to the unit delivery length of the cloth. The controller 7 stores the pulse number values [La] to [Ld] corresponding to the distances La to Ld of the cloth running route from the detection means 6 to the screens 4a to 4d. Means 6
The switching solenoid valve 1 attached to the cage operation means (not shown) of the first screen 4a when the number of pulses input from the first screen 4a matches the pulse value corresponding to the first screen 4a.
1a is issued from the controller 7, and the cage 5
By converting a from the operating position to the non-operating position, the a-passage portion can be passed through without performing the printing process.
Next, the counted pulse number is displayed on the second screen 4b.
When the pulse value corresponding to the above is coincident with the pulse value, a command is issued so that the cage 5b corresponding to the pulse value occupies the non-operating position.
It is possible to deactivate d with respect to the connection portion. If the predetermined timing at which the confounding part passes each screen is set beforehand based on the number of pulses and the cage of each screen is returned to the operating position again, the normal printing process is continued. .

A concrete example of the controller 7 which performs the above control operation is shown in a block diagram in FIG.

When the detection signal from the concatenated portion detecting means 6 is input to the register 21, its content is cleared, and the pulse generated from the pulse generator 10 is stored in the register 21. Registers 22a-22d associated with each solenoid valve 11a-11d
Is a pulse value [La] corresponding to the distance La to Ld.
[Ld] is preset, and these pulse values are input in parallel to the digital comparators 23a to 23d together with the number of pulses being stored in the register 21 and compared. When the two input signals match in each comparator, the instruction signals Sa to Sd are issued to the corresponding switching solenoid valves 11a to 11d to perform the above-described control operation.

FIG. 3 shows an example in which the present invention is applied to a flat screen printing device.

As in the above-mentioned example, the woven fabric 1 is fed on the belt 3 intermittently at a constant pitch, and a plurality of flat screens 4'a-4 'are provided on the belt 3 in the traveling direction.
The pattern is imprinted while stationary by d.

The difference between the rotary screen printing device described above and this embodiment is that the latter device itself already has a mechanism for feeding the cloth at an accurate constant pitch, and therefore the number of feeding pitches is counted as a pulse. This is to measure the delivery length of the cloth. That is, as the means corresponding to the former pulse generator 10, a feed pitch limiter 24, which is originally attached to the apparatus and which emits a feed signal each time intermittent feed is used, this feed signal is counted by a counter 25.

When a detection signal is generated by the concatenated portion detecting means 6'provided at the entrance of the cloth 1 and inputted to the counter 25, the counter 25 starts counting. The distance from the detecting means 6'to the working area of each of the flat screens 4'a to 4'd is converted into a predetermined pitch number and the counter 25 is used.
Is preset to. When the count signal from the counter 25 coincides with the number of pitches corresponding to the distance L' _{1a to} L' _2a to the working area of the first screen 4'a, the cage 5'a attached to the screen 4'a. The motor 26a for driving the motor 26a is constructed so that the relay incorporated in the operating circuit thereof operates to open the contact to make it inoperative, so that the cage operation is not performed, and therefore, the connection processing portion is subjected to the textile printing process. Is not implemented. When the count signal from the counter 25 is further input once or twice, the restart counter causes the motor 26a to start operating again, and the normal printing process is continued. Of course, the same operation is performed for each of the screens 4'b-4'd.

As described above in detail, according to the present invention, the connection portion is detected,
The signal starts the measurement of the fabric delivery length, the time when this length reaches each screen is measured, and the cage of the corresponding screen is held in the inoperative position. It is possible to prevent the printing process from being performed on the sheet, and it is therefore possible to eliminate the occurrence of so-called imperfect reflection of the image.

The present invention can be similarly applied to both a rotary screen and a flat screen.

[Brief description of drawings]

FIG. 1 is a schematic side view showing an example in which the present invention is applied to a rotary screen printing apparatus, FIG. 2 is an example of a block diagram of a controller shown in FIG. 1, and FIG. 3 is a flat screen printing apparatus according to the present invention. It is a schematic side view which shows the applied example. DESCRIPTION OF SYMBOLS 1 ... Cloth 2 ... Cloth roll 3 ... Belt 4a-4d ... Rotary screen 5a-5d ... Scages 5'a-5'd ... Scages 6 ... Coupling part detection means 7 ... Controller 10 ...... Pulse generator 11a to 11d ...... Switching solenoid valve 21 ...... Register 22a to 22d ...... Register 4'a to 4'd ...... Flat screen 24 ...... Feed pitch limiter 25 ...... Counter

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takeshi Tanaka 167 No. Hama-cho, Negami-cho, Nomi-gun, Ishikawa Komatsu Seiren Co., Ltd. (56) References JP-A-55-261 (JP, A) JP-A-49-1882 (JP, A) Actually-laid-open Sho-56-149638 (JP, U) JP-B-55-24427 (JP, B2) Actual public Sho 58-20366 (JP, Y2) Actual public Sho 55-42929 (JP, Y2)

Claims (5)

[Claims] 1. An automatic screen printing apparatus comprising a belt conveyor on which a fabric to be processed is placed and advanced in a stretched state, and a plurality of screens provided with cages provided above the conveyor along the traveling direction of the fabric. In, the pulse generating means for generating a pulse proportional to the length of the cloth to be sent, the detecting means for detecting the passage of the cloth concatenated portion and issuing a signal, and the cage attached to each screen is in either an operating position or an inactive position. The cage operation means for selectively holding the crab, and the detection signal from the detection means to start counting the pulses from the pulse generation means, and the count of the cloth path between the detection means and each screen. When the predetermined value corresponding to the length is met, the cage operating means is instructed to hold the cage of the screen in the inoperative position. An automatic screen printing device equipped with a controller that issues a number. 2. The automatic screen printing apparatus according to claim 1, wherein the screen is a rotary screen that continuously rotates. 3. The automatic screen printing apparatus according to claim 1, wherein the screen is a flat screen which operates intermittently in response to intermittent feeding of the cloth. 4. The automatic screen printing apparatus according to claim 3, wherein the pulse generator is a counter that counts the number of times of intermittent feeding of the cloth. 5. The automatic screen printing device according to any one of claims 1 to 4, wherein the cage operating means is an air cylinder with a switching solenoid valve.